When coral becomes stressed through pollution or the rising sea temperatures caused by climate change the algae that gives the coral it's amazing colours is ejected from the corals tissue leaving it prone to disease, taking away its main food source and most noticeably giving it a bleached appearance. The coral can recover from this but if the algae doesn't get reabsorbed fairly soon after expulsion the coral will die.

Based on the destruction of coral colonies I have simplified the coral forms to very basic shapes, stripping them of their colour, only retaining their beauty to demonstrate what we are losing.